Dex-Cool Extended Life 50/50 Prediluted Antifreeze Coolant. Prestone® Dex-Cool 50/50 Prediluted Extended Life Antifreeze/Coolant features the precise factory-fill blend by General Motors Corporation manufacturing. 50% antifreeze concentrate for temperature and corrosion protection. 50% specially demineralized water for vital heat transfer properties. This maintains the important original-fill blend, no matter where, when or how often you top off your cooling system. Prestone® Dex-Cool 50/50 Prediluted Extended Life Antifreeze/Coolant is recommended and formulated for use in all GM vehicles that require Dex-Cool® coolant, as well as other cars and light duty trucks with aluminum radiators. It has been approved by General Motors to be licensed as a Dex-Cool® product under the GM6277M specification, and will provide the following key benefits: Convenient, Ready-To-Use formula; Compatible with other Dex-Cool® approved coolants; Meets or exceeds ASTM and SAE standards for coolant corrosion protection; Meets GM6277M, Ford WSS-M7B44-D, and property and performance specification requirements of DalmierChrysler MS-7170, MS9769.